Conveying means in machines for manufacturing envelopes, paper bags, and the like



Feb. 11', v1930.

T. HUGO CONVEYING MEANS IN MACHINES FOR MANUFACTURING ENVELOPES, PAPER BAGS, AND THE LIKE 8 Sheets-Sheet 1 Filed June 29. 1926 igg. Fig. 1

Feb. 1l, 1930. T- HUG() 1,747,074 Y CONVEYING MEANS IN MACHINES FOR MANUFACTURING ENVELOPES, PAPER BAGS, AND THE LIKE Filed June 29. 1926 8 Sheets-Sheet 2 jizz/enger* Zea Jar' )fw o Warne/0A Feb. 1l,l 1930. T; HUGO CONVEYING MEANs IN MACHINES ECR MANUFACTURING ENvELoPEs, PAPER BAGs,AND 4THE LIKE Filed June 29, 1926 u 3 of 7 Lm 4 e 7s 1. .r .t e .e h s 8 Figi Feb. 11, 1930. .'r. HUGO 1,747,074

CONVEYING MEANS IN MACHINES FOR MANUFACTURING ENVELOPES, PAPER BAGS, AND THE LIKE Filed June 29. 1926 8 Sheets-Shawl'I 4 Feb. 11,'"3o- T. HUGO 1,741,074 A CONVEYING MEANS IN MACHINES FOR MANUFACTURING ENVELOPES PAPER BAGS, AND THE LIKE Filed June 29. 1926 8 Sheets-Sheet 5 27a/farne T. HUGO CONVEYING MEANS IN MACHINES FOR MANUFACTURING ENVELOPES, PAPER BAGS, AND THE LIKE Filed June 29, 1926 8 Sheets-Sheet 6 12 Figs.

8 Sheets-Sheet 7 Feb. l1, 1930. T. HUGO CONVEYING MEANS IN MACHINES FOR MANUFACTURING rrzegl,

Feb. 11, 1930. T, HUGO 1,747,074

CONVEYING MEANS IN MACHINES FOR MANUFACTURING ENVELOPES, PAPER BAGS, AND THE LIKE Filed June 29.11926 8 Sheets-sheet 8 Peiemed Feb. 11, 1930 UNITED STATES THEODOR HUGO, F WILMERSDORE, NEAR BERLIN, GERMANY CONVEYING MEANS IN MACHINES FOR MANUFACTURING ENVELOPES, `IEAPEIR. I BAGS,

AND THE LIKE Application led .Tune 29, 1926, Serial No. 119,392, and in Germany February 22, 1926.

This invention relates to. new and useful improvements in machines for making envelopes, paper bags and the like and consists especially in the provision of certain means for increasing the working speed and the output of the machine.

Generally in machines of this kind conveyer bands are usually used for transporting the blanks from one station or operating point to the other.

The main object of the invention resides in the provision of pairs of conveyer bands or belts which act upontlie blanks with varying frictional engagement in such a manner, that the blanks are taken off from the pile or any other operating point or station at slow speed, then are transported at a greater speed over the greater portion of the transporting space and are finally brought to slow speed at or near the delivery point, as, for instance, the adjusting devices at the folding boX.

In this manner, even thin sheets of paper can be formed to accurately folded envelopes, bags or the like, without necessitating the slowing up of the working speed of the machine. F or when the blanks are taken off and delivered to the conveyor bands at a slow speed they are carried without shock to the adjusting devices and may be adjusted accurately by these devices, so that the following working operation out.

It is known that conveyer bands are better Ythan the other transporting means, as grippers, tongs or gummers, used up to date, because these means represent comparatively heavy swinging masses, which necessarily limit the working speed, so that machines with these swinging means are capable of accurately performing about 2120-15() operations per minute. These "drawbacks are partial-ly overcome, if conveyer bands are used, but nevertheless the working speed may notI be increased in the known machines, in which the bands are driven with equal speed, because in this case the blanks are pushed too rapidly and vigorously against the adjusting devices, so that, especially the blanks of thin papers, are folded or deformed.

This last-named drawback is fully premay be properly carried vented by this invention, the present conveyer bands being driven with varying friction between them, so that the blanks are moved at a low speed to the adjusting devices.

Thus machines constructed according to this invention have a considerably increased output; that is to say, they may work at 200 to 250 operations per minute, without causl ing any interruptions by deformed blanks.

The varying friction between the conveyer bands according to the invention may be attained by arranging the pairs of bands in such a manner, that one support of one band' of the pair is fixed, whilst the support of the other band is arranged adjustably and varyingly so that it maybe pressed with different force against the first band. The pressure of the latter band against the other may be regulated -during and' by the driving mechanism of the machine, so that it works automatically. ItV will also be possible to arrange both mountings for bands of the pair movably, so that both bands are-pressed together for transporting the blanks with great speed, and are moved one from the other lfor receiving or delivering the blanks.

In the accompanying drawings, several constructions of transporting means according to the invention are shown.

Figure 1 1s a side elevation of an envelope making machine with the blank lfeed means in operative relation thereto.

Figure la is a side elevation, on a larger scale than Figure 1, of the upper portion of the machine as viewed from the side thereof opposite to that shown in Figure 1.

Figure 2 is a top plan view of the machine.

Figure 2a is a top plan view of the sheetforming mechanism shown in Figure 2 but on a larger scale.

Figure 3 is a view in side elevation of a segment-actuated mechanism for imparting the desired action to the conveyer bands or belts.

Figure 4 is a top plan.

Figure 5 is a detail view of the ratchet mechanism employed with the construction shown in Figure 4e.

Figure 6 shows the band-separating means illustrated in Figure 3, the same being in band-separating position.

Figure 7 is an end view thereof with the bands in section and separated.

Figure 8 is a View similar to Figure 6 of a separating mechanism wherein both bands are moved apart simultaneously by a double mechanism as shown in Figures 6 and 7.

Figures 9 and 10 are detail side view and end view of a cam mechanism for elevating one band to separate the bands.

Figures 11 and 12 show side and end sectional views of the c'onveyer bands mounted upon'adjustable and rotatable eccentrically mounted rollers, whereby as the rollers are rotated by the bands the bands adjacent to the rollers are moved to and from each other.

Figure 13 is a top plan view thereof.

Figure 14 is a top plan view of the box foldingdmachine with which this feature can be use Figure 15 is a side view thereof.

Figure 16 is a cross-sectional view thereof.

Figures 17 and 18 illustrate the novel blank feeding means used in combination with a printing device.

In Figs. 1, l, 2, and 2a a complete machine for the manufacturing of envelopes from blanks arranged in a. pile is shown, with all main parts, which are driven from the main driving shaft 3 by means of cams 4 and 5 and the like.

The operation of feeding the sheets is effected in the following manner The suction head 54 is connected with a suction pump (not shown) by means of the hollow shaft 55 and hose 56. The shaft 55 is rotatable in two crank-arms 58 pivote'd to the bearing standards 12. The suction head 54 has, therefore, rotating and vertical movements and by this action picks up the uppermost sheet from the pile 57 in order to place the same in the position 57a shown in dotted lines. The sheet is then placed against the stops 59 carried by the arms 60, and attached to the bearing blocks 13, by which the shaft 13 of the loose conveying drums is supported. The suction head 54 draws the sheet 57 l between the conveying'belts 1 and 2, which are at this moment spread apart thereby, and the bars 14 are drawn towards the left by means of the angle-lever gearing 16 controlled by the machine, so that the wedgeshaped ends 14 will separate the bearing blocks, carrying the conveying belt drums 10 and 11 and the supporting shafts 13 and 15 and against the action of the spring 12a. This distance of the separating of the conveying belts is in reality less than has been illustrated for the purpose of clear demonstration (amounting, in practice, to only a few millimeters), so that the gears 10a and 11a provided with amply large teeth and coupling the driving shafts of the conveying drums are not disengaged. As it is desirable to separate the belts farther apart at the feedin end than at the outlet end, the wedgeshaped ends of the bars 14 at the outlet end are made' at a greater angle.

In the position illustrated, the conveying The bar 18 controlled by the machine gearing is now actuating the lever actuated toothed segment 17, the toothed segment of which meshes with the gear 19 loosely mounted upon the shaft 13 but firmly connected with the toothed disc 21. The toothed disc 21 engages with theratchet-wheel 20 keyed to the shaft 13. Thus the belts are moved intermittently forward by means of vthe toothed segment 17.

This feeding 4of the sheets is also assisted by the stops 5 9 which are also lowered during the downward motion of the upper bearing blocks 13a, so that the sheet 57a can slide over the same.

The sheet 57a is thereby moved into the position indicated by 'dotted lines at the right hand end of Figure 2 and also across the mould box 29. The opening of this mould box4 29 is at this time closed by the horizontally disposed fingers 34 and 35 mounted upon the shafts 32 and 33, coupled by the rods 14, so that the sheet cannot slide into the mould box.

Shortly before the sheet reaches the position shown in dotted lines at the right hand y end of Fig. 2, the conveying belts 1 and 2 are separated gradually by the bars 14 and the lever gearing 16, so that the fed sheet is no longer clamped between the same, but only rests loosely upon the lower belt. It remains, consequently, in the illustrated position as soon as it touches the stops 30 firmly attached to the mould box 29. The speed of travel of this sheet has been reduced before it touches the stops 30; therefore, with this arrangement even thin paper will engage the stops 30 smoothly and without injury to the paper.

By means of the bars 37 controlled from the machine drive, the aligners 31, mounted upon the shaft 31' 1 and located below the sheety feeding planes, are now moved into the position indicated in Figures 1a and 2a, abutting against and moving the sheet, so that the same is moved between the fixed stops 30 and the'aligners 31 over the mould box 29 in the proper position.

variable and adjustable belt velocity and the intermittent clamping together of the belts upon the sheet. Y

In the construction shown in Figs. 6 and 7, which are, respectively, a side elevation and an end view partly in section, t-he conveyer bands 1 a d 2 are driven continuously at a constant sreed. In this case also, the drum 10 of the conveyor band 1 is vertically movable by means of the bar 14 and the lever 16, so that the friction between the bands 1 and 2 can be increased or diminished in the manner required. The rod 16 in this case is preferably actuated .by a cam disc or the like in such a manner that during the reception of the blank the friction between the bands is diminished, so that lthe blanks receive only a small accelaration when taken off. During the feeding movement the friction is increased, since both conveyor bands are pressed tightly together and, in the neighborhood of the position in which the blank is discharged, the friction is again reduced, so as drawal so that the velocity with which the blanks are conveyed, even at the maximum output, is such as to convey and discharge the blanks properly. n

In the construction shown-in Fig. 9 in side elevation, and in Fig. 10 in end elevation, the drums 10 and 11 of the upper conveyer band 1 and of the lower conveyer band 2 are both mounted in their bearings 12 so as to be movable both in a vertical direction. On the axles 13 and 15 of the drums 10 and 11 there are two contacting eccentric discs 23 and 24. In this arrangement at each complete rotation of the drums 10 and 11 their axles 13 and 15 and with them the bands 1 and 2 due to the discs 23 and 24 are brought close together and then again withdrawn one from the other, so

that the friction is alternately increased and diminishediand the speed at which the blank are fed is suitably controlled.

In Figs. 11, 12 and 13 a construction is shown, respectively, inside elevation, end

elevation and plan, in which, due to the eo.

centric mounting of the axles 13 and 15 or the drums 10 and 11, the frictional resistance between the bands l and 2 can be adjusted at any time while the machineis in operation. The axles 13 and 15 are provided with eccentric journals 25 and 26 arranged in bearing block 12, and by rotating these journals by hand Wheels 27 and 28, the axles 13 and 15 are caused to be brought closer or moved farther apart.

The usual devices for conveying the blanks to the folding boxes grip the blanks at a projecting corner of the blank, so that it is brought correctly over the folding box. When, however, as in the present case, conveyer bands are used they must travel on each side of the folding box and there is the danger that p' the projecting corner of the blank may abut against the walls of the folding box andcause an interruption in the work. For this reason, in the machine according to the invention, care must be taken that the projecting corner of the blank is led accurately over the folding box. Guides are provided for this purpose on the upper edges of the folding box which, during the feeding movement of the blank, cover the opening of the box` so that the blank with the projecting corner is correctly and reliably led over it, while during the folding process, the guiding devices are folded downwards into the llbox and then lie clos/e against thevralls of this Figs. 14, 15 and 16 show a construction of this kind, in which Fig. 14 is a plan and Figs.

15v and 16, respectively, side and sectional elevations. The folding box consists in the usual side walls 29 with stops 30 and adjustlng blocks 31. At the upper longitudinal edges of the folding box, the guides 34' and 35, rotatably mounted on spindles 32 andv 33, are arranged so that in the horizontal position they cover the opening of the folding box, but in the `vertical position are folded down and lie closely against the walls of the box. The guides 34 and 35 are actuated by a rod 36 from a cam disc or the like by which the spindles 32 and 33 are rotated, so that th opening of the folding box is either bridged over or is free, as required by the working of the machine. The adjusting blocks are controlled 'in known manner by a rod 37 When, therefore, a blank is brought by the conveyer bands to the folding box, the guides 34 and 35 bridge the opening of the box, so that the blanks can arrive positively into the position shown in dotted lines in Fig. 14. As soon as the blank is engaged by they stops 30' and hasbeen brought into the correct position vby the adjustingblocks 31, the guides 34 and 35 ,are folded downwards and a passage is. opened for the plunger.

In Figs. 17 and 18 a further modification is represented, respectively, in plan and side elevation, in which the blank is printed on its path andduring movement to the folding' box. The use of continuously moving conveyer bands' according to the invention enables rotary printing devices to be used, with all their favorable features.

As shown in Figs. 17 and 18, the printing device 39 is conveniently arranged between and driven by the sets 40 and 41 of conveyer bands, so that the rotation of the printing cylinder corresponds exactly with the speed of delivery of the blank.

Also, obviously, other operating positions can be inserted in the path of the blank to the folding box and so that the blank is continuously carried forward by the conveyer bands, or is held stationary at the different operating positions.

The various elements shown and used in combination with the novel band feeding means are indicative of any means where it is desirable to have an article received at a slow speed, carried at an increased speed, and finally delivered at a slow speed, and where the term folding machine is used in the specification and claims, the same is indicative of a printing, cutting or folding mechanism, or, in fact, any mechanism that the feeding device can be operated in conjunction with.

I claim 1. The combination with a blank folding device, of pairs of conveyer belts which trans- THEQDOR HUGO.

nature.

portt-he blanks to the folding device and means for intermittently raising and lowering the upper belt at the introduclng place in respect of the lower belt.

2. The combination with a blank folding i device, of pairs of conveyer belts which transport the blanks to tli'e folding device and means for intermittently raising and lowering the upper belt at the introducing place in respect of the lower` belt, the raising and lowering of the upper' belt being adjustable during the working of the machine.

3. The combination with a blank folding device, of pairs of conveyer belts which transport the blanks to the folding device and means forfintermittently raising and lowering the upper belts at the introducing place in respect of the lower belts, and the combination with a gripper device which delivers the blanks to the belt-pairs.

4. The combination wit-h grippers for primarily delivering blanks and a folding device, of pairs ofconveyer belts which transport the blanks from the grippers to the folding device and means for intermittently raising and lowering the upper belts at the introducing place in respect of the lower belts.

5. The combination with a blank folding machine, of a pair of rollers, a pairof conveyer belts passing around said rollers for 

